CN101976546B - Pixel circuit and light-emitting panel with power supply voltage drop compensation function - Google Patents
Pixel circuit and light-emitting panel with power supply voltage drop compensation function Download PDFInfo
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Abstract
The invention relates to a light-emitting panel and a pixel circuit with a power supply voltage drop compensation function. The light-emitting panel comprises a plurality of pixel circuits and a plurality of compensation circuits, wherein each pixel circuit comprises a detection switch. When the actual working potential of the pixel circuit is output to the corresponding compensation circuit through the detection switch, the corresponding compensation circuit adjusts the data on the data line electrically coupled to the corresponding pixel circuit according to the relationship between the actual working potential and the original working potential.
Description
Technical field
The present invention relates to a kind of image element circuit and luminescent panel circuit, and particularly fall the image element circuit and the luminescent panel circuit of compensate function relevant for a kind of tool supply voltage.
Background technology
(Organic Light Emitting Diode, OLED) display has characteristics such as thin thickness, in light weight, autoluminescence, low driving voltage, high-level efficiency, high contrast, high color saturation, reaction velocity be fast to light emitting diode.Be regarded as the thin film transistor (TFT) that continues (Thin Film Transistor, TFT) after the display, the emerging display technique that is expected most.
See also Fig. 1, it shows known light emitting diode indicator 10 circuit diagrams.As shown in Figure 1, light emitting diode indicator 10 comprises N * M image element circuit, and this N * M image element circuit is electrically coupled to electric current supply line I to receive original operating potential OVDD.Moreover N image element circuit of each row is electrically coupled to same control line; For instance, N the image element circuit (1,1), (1,2) of first row ..., (1, N) be electrically coupled to control line SCAN-1.Moreover the M of each a row image element circuit is electrically coupled to same data line to receive the data current potential; For instance, M the image element circuit (1,1), (2,1) of first row ..., (M, 1) be electrically coupled to data line DATA-1 with reception data current potential Vdatal.In light emitting diode indicator 10, whether each image element circuit is opened is to be controlled by its pairing control line; Moreover the brightness that each image element circuit produced and the original operating potential OVDD that electric current supply line I is provided provide the drive current to the image element circuit relevant, and the size of drive current is then controlled by the image element circuit corresponding data lines.
See also Fig. 2, it shows the circuit diagram of arbitrary image element circuit in the known light emitting diode indicator 10.As shown in Figure 2, image element circuit 20 mainly comprises the first transistor switch T1, transistor seconds switch T2, capacitor C 1 and light emitting diode OLED.Wherein, the control end of the first transistor switch T1 is electrically coupled to control line SCAN; First path terminal of the first transistor switch T1 is electrically coupled to data line DATA to receive data current potential Vdata; The control end of the alternate path end of one end of capacitor C 1, the first transistor switch T1 and transistor seconds switch T2 is electrically coupled to data storing node P; First path terminal of the other end of capacitor C 1 and transistor seconds switch T2 is electrically coupled to electric current supply line I to receive original operating potential OVDD; The alternate path end of transistor seconds switch T2 is electrically coupled to first end of light emitting diode OLED; The second end ground connection of light emitting diode OLED.
As shown in Figure 2, whether control line SCAN decision makes between first and second path terminal of the first transistor switch T1 electrically conducts; That is control line SCAN is during activation the time, the first transistor switch T1 electrically conduct (because the first transistor switch has here used the P transistor npn npn, so control line can be in than electronegative potential during activation).After the first transistor switch T1 electrically conducted, first path terminal of the first transistor switch T1 was written in the capacitor C 1 by the data current potential Vdata that data line DATA is received.The capacitor C 1 that writes data is because of having potential difference (PD), and this potential difference (PD) will cause transistor seconds switch T2 to electrically conduct.At this moment, electric current supply line I can provide drive current to make it luminous to light emitting diode OLED through transistor seconds switch T2.In image element circuit 20, the drive current size of the light emitting diode OLED that flows through is: I
OLED=K (OVDD-Vdata-|V
Th|)
2Wherein, I
OLEDBe the drive current of the light emitting diode OLED that flows through, K is a constant, and Vth is the critical voltage (Threshold Voltage) of transistor seconds switch T2.
In theory, the operating potential that received from electric current supply line I of a plurality of image element circuits as shown in Figure 1 is all had a fixed value OVDD.Yet because there is wired resistance in electric current supply line I, and this line resistance can cause electric current supply line I to produce supply voltage in operation to fall, and the real work current potential that finally causes a plurality of image element circuits to be received from electric current supply line I is not to be fixed value OVDD.For instance, as shown in Figure 3, the real work potential value that first image element circuit 30 is received from electric current supply line I is original operating potential OVDD.Yet, because the supply voltage existence of falling, make real work potential value OVDD ' that second image element circuit 32 received from electric current supply line I less than original operating potential OVDD.Because first image element circuit 30 is OVDD and the actual real work potential values of being obtained of second image element circuit 32 are OVDD ' from the real work potential value that electric current supply line I obtained; Even first image element circuit 30 and second image element circuit 32 have equal values from the data current potential Vdata that data line DATA receives; The drive current that it produced is still different, and this will cause the inhomogeneous of brightness that first image element circuit 30 and second image element circuit 32 produced.
Suppose that a plurality of image element circuits are showing same color in the light emitting diode indicator; That is a plurality of image element circuits are when data line DATA reception has the data current potential Vdata of identical sizes values; This moment, the supply voltage general who has surrendered caused a plurality of image element circuits to have different value from the real work current potential that electric current supply line I is received; And then cause the drive current of each image element circuit of flowing through to have different value, the brightness that finally causes these current driving elements and produced inhomogeneous.Therefore, how the offset supply voltage drop is present problem extremely to be solved to the influence that light emitting diode indicator caused.
Summary of the invention
The purpose of this invention is to provide image element circuit and luminescent panel circuit that compensate function falls in a kind of tool supply voltage, to promote the uniformity coefficient of luminescent panel brightness.
The embodiment of the invention proposes a kind of image element circuit; Be electrically coupled to electric current supply line, at least one control line and data line; Data line is in order to provide data; Image element circuit comprises: current driving element, comprise first end and second end, and current driving element is luminous when first end flows to second end at electric current; Current control circuit; When according to the current potential on first control line decision is driving data from the data line reading of data and with the data storing that is read; Current control circuit receives the real work current potential from electric current supply line, and according to the size of current of driving data to determine to get into current driving element through current control circuit from electric current supply line; And detection switch; Comprise control end, first path terminal and alternate path end; First path terminal of detection switch is electrically coupled to current control circuit receiving the real work current potential, and whether the control end of detection switch is electrically coupled to second control line and makes with decision between first and second path terminal of detection switch and electrically conduct.
In preferred embodiment of the present invention; Above-mentioned current control circuit comprises: first switch; Comprise control end, first path terminal and alternate path end, the control end of first switch is electrically coupled to first control line, and first path terminal of first switch is electrically coupled to data line; Electric capacity, an end of electric capacity and the alternate path end of first switch are electrically coupled to the data storing node, and the other end of electric capacity is electrically coupled to electric current supply line; And second switch; Comprise control end, first path terminal and alternate path end; The control end of second switch is electrically coupled to the data storing node; First path terminal of second switch is electrically coupled to electric current supply line, and the alternate path end of second switch is electrically coupled to first end of current driving element.
In preferred embodiment of the present invention, the first above-mentioned control line and second control line are same control line.
In preferred embodiment of the present invention; The first above-mentioned control line and second control line are for transmitting different time sequence control lines respectively; During the activation of first control line during the activation of second control line after, and not overlapping during the activation of first control line and second control line.
In preferred embodiment of the present invention, the alternate path end of above-mentioned detection switch is electrically coupled to data line.
The present invention proposes a kind of luminescent panel, comprising: many data lines; Many control lines; Many power supply lines; A plurality of image element circuits and a plurality of compensating circuit.Wherein, each image element circuit is electrically coupled at least one control line, an electric current supply line and a data line, and each image element circuit comprises: current driving element, current control circuit and detection switch.Current driving element comprises first end and second end, and luminous when first end flows to second end at electric current.When current control circuit is driving data from corresponding data line reading of data and with the data storing that is read according to the current potential on first control line decision; This current control circuit receives the real work current potential from corresponding electric current supply line, and according to the size of current of driving data to determine to get into current driving element through current control circuit from corresponding electric current supply line.Detection switch comprises control end, first path terminal and alternate path end; This first path terminal is electrically coupled to current control circuit receiving the real work current potential, and whether the control end of detection switch is electrically coupled to second control line and makes with decision between first and second path terminal of detection switch and electrically conduct.In addition; The alternate path end of the detection switch in each image element circuit is electrically coupled to one of corresponding a plurality of compensating circuits; Compensating circuit is then according to current potential on the alternate path end of this detection switch and the relation between original operating potential, and adjustment and corresponding image element circuit be the data on the data line of electric property coupling mutually.
In preferred embodiment of the present invention; Above-mentioned luminescent panel; More comprise: a plurality of switch units; Each switch unit is corresponding to a data line and a compensating circuit, and switch unit switches so that corresponding data line is electrically coupled to the output terminal or the input end of corresponding compensating circuit.
In preferred embodiment of the present invention, each above-mentioned compensating circuit comprises: the current potential reading unit, have input end and output terminal, and the input end of current potential reading unit is electrically coupled to corresponding detection switch to obtain and to export corresponding current potential; And comparing unit, be electrically coupled to the output terminal of current potential reading unit, in order to the current potential on the output terminal of current potential reading unit relatively and the difference value of original operating potential, and adjust the data on the corresponding data line with difference value.
The present invention is because of adopting compensating circuit; Therefore for the line resistance that in electric current supply line, is produced electric current supply line is got into the influence of the size of current of current driving element through current control circuit, can see through compensating circuit compare image element circuit operating potential and original operating potential difference value and the data on the data line are compensated.
For let above-mentioned and other purposes of the present invention, feature and advantage can be more obviously understandable, hereinafter is special lifts preferred embodiment, and cooperates appended accompanying drawing, elaborates as follows.
Description of drawings
Fig. 1 illustrates and is known light emitting diode indicator circuit diagram;
Fig. 2 illustrates the circuit diagram into arbitrary image element circuit in the known light emitting diode indicator;
Fig. 3 illustrates the circuit diagram into known adjacent two image element circuits;
Fig. 4 illustrates to having supply voltage according to an embodiment of the invention and falls the circuit block diagram of the luminescent panel of compensate function;
Fig. 5 illustrates to having supply voltage according to another embodiment of the present invention and falls the circuit block diagram of the luminescent panel of compensate function;
Fig. 6 illustrates to having the circuit block diagram of image element circuit that compensate function falls in supply voltage and corresponding compensating circuit according to an embodiment of the invention.
Wherein, Reference numeral
10,60: luminescent panel 20,30,32,40: image element circuit
42: current control circuit 44,440～448: compensating circuit
46: current potential reading unit 48: comparing unit
62: source electrode drive circuit 400～408, DATA: data line
410～418: data read line 740～748: switch unit
SCAN, SENSE: control line C1, C2: electric capacity
I, I
1, I
2, I
3: electric current supply line OLED: light emitting diode
T1, T2, T3, T4: transistor switch P: data storing node
Embodiment
See also Fig. 4, it shows the circuit block diagram that the luminescent panel of compensate function falls in embodiments of the invention tool supply voltage.As shown in Figure 4, this luminescent panel 60 has comprised many data lines 400,402...408, many control line SCAN-1, SCAN-2...SCAN-M, many power supply line I
1, I
2... I
3, a plurality of compensating circuit 440,442...448, and a plurality of image element circuit (1,1), (1,2) ... (M, N).N image element circuit of each row is (like (1,1), (1,2) ... the control end of the transistor switch of (1, N)) (the first transistor switch is claimed in the back) T1 and transistor switch (detection switch is claimed in the back) T3 is electrically coupled to same control line (like SCAN-1); Moreover the alternate path end of the detection switch T3 of the M of each a row image element circuit (like (1,1), (2,1) ... (M, 1)) is electrically coupled to the input end of same compensating circuit (like compensating circuit 440) through data read line (relatively like data read line 410).Moreover first path terminal of the detection switch T3 of the M of each a row image element circuit is electrically coupled to electric current supply line (like electric current supply line I
1), and first path terminal of the first transistor switch T1 of the M of each a row image element circuit is electrically coupled to the output terminal of same compensating circuit (like compensating circuit 440).
Each compensating circuit major function is (like pixel circuit (M according to a certain image element circuit; 2) the difference value relation of the detection switch T3 in between the original operating potential OVDD that the source provided of the real work current potential OVDD ' of electric current supply line institute actual reception and same electric current supply line; The adjustment electric property coupling is the data on the data line of image element circuit (corresponding like data line 402) so far; Reaching compensation, and then eliminate difference value between real work current potential OVDD ' and original operating potential OVDD to the influence of drive current to the drive current of the light emitting diode OLED in the image element circuit of flowing through.Wherein, compensating circuit 440～448 can be set at any position, and for example in the present embodiment compensating circuit 440～448 is set in the source electrode drive circuit (Source IC) 62.
For instance, during control line SCAN-2 activation, image element circuit (2,1) is from electric current supply line I
1The real work current potential OVDD ' that is received can be sent to corresponding compensating circuit 440 by the detection switch T3 that electrically conducts through data read line 410.During the same activation of control line SCAN-2; Compensating circuit 440 is according to image element circuit (2; 1) difference value of the real work current potential OVDD ' of actual reception and original operating potential OVDD; Export data potential value Vdata1 ' after the compensation to the data line 400 of image element circuit (2,1) electric property coupling on (just being provided on first path terminal of the first transistor switch T1 in the image element circuit (2,1)); And then reach adjustment to the drive current of the light emitting diode OLED in the image element circuit of flowing through (2,1).
See also Fig. 5, it shows has supply voltage according to another embodiment of the present invention and falls the circuit block diagram of the luminescent panel of compensate function.The function that embodiment shown in Figure 5 and the maximum difference of Fig. 4 are in the data read line 410～418 in embodiment shown in Figure 4 to be provided is incorporated into respectively among the corresponding data line 400～408.And in order to reach and embodiment identical functions shown in Figure 4, every the data line 400～408 among the embodiment shown in Figure 5 can be taken on the work that provides data to compensating circuit 440～448 or receive data from compensating circuit 440～448 through the operation of corresponding switch unit 740～748; Moreover the first transistor switch T1 of each image element circuit and detection switch T3 are because must open in the different periods, so also must separately receive the control of different control lines.
Specifically; N image element circuit of each row in the embodiment shown in Figure 5 is (like pixel circuit (1; 1), (1; 2) ... the control end of the first transistor switch T1 of (1, N)) is electrically coupled to same first control line (corresponding like SCAN-1), the control end with the detection switch T3 of N image element circuit of delegation then is electrically coupled to same second control line (corresponding like SENSE-1).Moreover it is (corresponding like electric current supply line I that first path terminal of the detection switch T3 of the M of each a row image element circuit (like pixel circuit (1,1), (2,1) ... (M, 1)) is electrically coupled to electric current supply line
1), its alternate path end and the first path terminal property of the first transistor switch T1 are coupled to first end of same switch unit (corresponding like switch unit 740).Second end of switch unit is changeable between the input end and output terminal of compensating circuit.Wherein, second end of switch unit switches to the input end of compensating circuit during the aforesaid second control line activation, and during the first control line activation, switches to the output terminal of compensating circuit.
For instance, with the activation of the second control line SENSE-2 of image element circuit (2,1) phase electric property coupling during, second end of switch unit 740 can be switched to the input end of compensating circuit 440.Image element circuit this moment (2,1) is from electric current supply line I
1The real work current potential OVDD ' that received can be transferred into compensating circuit 440 through the detection switch T3, data line 400 and the switch unit 740 that electrically conduct.Next; During the activation of the first control line SCAN-2; Second end of switch unit 740 can be switched to the output terminal of compensating circuit 440; This moment, compensating circuit 440 was exported compensation back data potential value Vdata1 ' to data line 400 according to current potential that eve received and the difference value of original operating potential OVDD, and then reached the adjustment to the drive current of the interior light emitting diode OLED of the image element circuit of flowing through (2,1).
See also Fig. 6, it shows has supply voltage according to an embodiment of the invention and falls the image element circuit of compensate function and the circuit block diagram of corresponding compensating circuit.Show that like Fig. 6 image element circuit 40 of the present invention mainly comprises current control circuit 42, light emitting diode OLED and detection switch T3.Current control circuit 42 mainly comprises the first transistor switch T1, transistor seconds switch T2 and capacitor C 1.In image element circuit 40 of the present invention, the first transistor switch T1, transistor seconds switch T2, capacitor C 1 are identical with known image element circuit 20 (Fig. 2) with annexation between light emitting diode OLED, do not repeat them here.Whether the control end 401c of the first transistor switch T1 is electrically coupled to the first control line SCAN and makes with decision between the first path terminal 401a and the alternate path end 401b of the first transistor switch T1 and electrically conduct; That is the first control line SCAN is during activation the time, and the first transistor switch T1 electrically conducts.The first path terminal 402a of transistor seconds switch T2 is electrically coupled to electric current supply line I to receive real work current potential OVDD '.Because the influence of line resistance, the original operating potential value OVDD that the source received of real work current potential OVDD ' and electric current supply line I is difference to some extent.Whether the control end 403c of detection switch T3 is electrically coupled to the second control line SENSE and makes with decision between the first path terminal 403a and the alternate path end 403b of detection switch T3 and electrically conduct; That is in the time of during the second control line SENSE activation, detection switch T3 electrically conducts.The first path terminal 403a of detection switch T3 is electrically coupled to electric current supply line I with same reception real work current potential OVDD '.
As shown in Figure 6, the alternate path end 403b of detection switch T3 is electrically coupled to compensating circuit 44.Compensating circuit 44 comprises current potential reading unit 46 and comparing unit 48.The input end 462 of current potential reading unit 46 (input end that also can treat as compensating circuit 44) is electrically coupled to the alternate path end 403b of detection switch T3, and the output terminal of current potential reading unit 46 is electrically coupled to the first input end 482 of comparing unit 48.Moreover the data current potential Vdata on original operating potential OVDD and the data line DATA inputs to comparing unit 48 through second input end 484 and the 3rd input end 486 of comparing unit 48 respectively.The output terminal of compensating circuit 44, that is the output terminal 488 of comparing unit 48 are electrically coupled to the first path terminal 403a of detection switch T3.
In the present embodiment; The second control line SENSE electrically conducts between the first path terminal 403a and the alternate path end 403b of detection switch T3 making during the activation, so the real work current potential OVDD ' that received of the detection switch T3 first path terminal 403a can be transferred to the input end of current potential reading unit 46.Current potential reading unit 46 can be designed to high input impedance device (high input-impedance device), and like this then current potentials on current potential reading unit 46 receiving ends 462 are understood the utmost points and are similar to the real work current potential OVDD ' that is received on the first path terminal 403a of detection switch T3.Comparing unit 48 compares the difference value of real work current potential OVDD ' and original operating potential OVDD, and adjusts the data current potential Vdata on the corresponding data line (DATA) with this difference value.That is; After the data current potential Vdata of comparing unit 48 on receiving real work current potential OVDD ', original operating potential OVDD and data line DATA; Through relatively with the operation (making Vdata '=Vdata-(OVDD-OVDD ') in the present embodiment) of calculating afterwards, again by the first path terminal 401a of data line DATA output compensation back data potential value Vdata ' to the first transistor switch T1.Compensation back data potential value Vdata ' then through control line SCAN among the first path terminal 401a of conducting the first transistor switch T1 during the activation and alternate path end 401b are written in current control circuit 42.As previously mentioned, because: I
OLED=K (OVDD '-Vdata '-| V
Th|)
2And Vdata '=Vdata-(OVDD-OVDD '), the drive current of the light emitting diode OLED that therefore flows through is adjusted to the I of tool right value
OLED=K (OVDD-Vdata-|V
Th|)
2
As previously mentioned, current potential reading unit 46 is the high input impedance device.Current potential reading unit 46 can (operational amplifier, impact damper (buffer) or the device for detecting voltage of other any tool high input impedances (input current levels off to 0) OP) realized be realized by operational amplifier.
Moreover analog subtracter (difference amplifier) or any other device that can reach analog subtracter that comparing unit 48 can be realized by a plurality of analog electrical bit comparators (comparator), by operational amplifier are realized.
Moreover the first control line SCAN and the second control line SENSE can be for transmitting different time sequence control lines respectively or being same control line.For instance, being illustrated in figure 5 as the first control line SCAN is a kind of embodiment of different time sequence control lines with the second control line SENSE.When both are different time sequence control line; Do not have specific sequential relationship requirement during the activation of the first control line SCAN with during the activation of the second control line SENSE, its difference only is that the compensation of present data is based on the data of former frame picture and carries out or based on the data of present picture and carry out.Yet, owing to the line resistance effect can change in adjacent a few frame pictures hardly to some extent, so the difference on this kind benchmark can't cause too much influence.
For instance; After can be during the activation of the second control line SENSE during the activation of the first control line SCAN (because here the first transistor switch T1 and detection switch T3 have used the P transistor npn npn; Therefore control line can be in than electronegative potential during activation), and not overlapping during the activation of the first control line SCAN and the second control line SENSE.Thus, detection switch T3 can first conducting, and required adjustment amount when calculating offset data in view of the above; And after calculating adjustment amount, this adjustment amount just can directly be added in the video data of preparing to provide to the corresponding data line, conveniently carries out the compensation of video data.Perhaps; In another example; Detection switch T3 and the first transistor switch T1 can open at the same time or control (as shown in Figure 4) by same control line; This moment, the adjustment amount that calculated can compensate in the back segment time that this secondary data writes, and also can remain to wait for next time that data are write and fashionablely compensate again.Certainly, be not that every frame picture all need carry out once aforesaid supply voltage and falls compensating operation.User or deviser can think at it fully and just carry out the operation of primary power source voltage-drop compensation when being necessary, and each compensation rate of gained is noted to carry out suitable this compensation rate before compensating operation falls in supply voltage next time in will operate.
In sum; Fall in the image element circuit and luminescent panel circuit of compensate function at tool supply voltage of the present invention; The resistance of the line that produced in the electric current supply line gets into the influence of the size of current of current driving element to electric current supply line through current control circuit, can through compensating circuit compare image element circuit operating potential and original operating potential difference value and the data on the data line are compensated.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
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| CN2010105272803A CN101976546B (en) | 2010-10-19 | 2010-10-19 | Pixel circuit and light-emitting panel with power supply voltage drop compensation function |
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| CN2010105272803A CN101976546B (en) | 2010-10-19 | 2010-10-19 | Pixel circuit and light-emitting panel with power supply voltage drop compensation function |
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